__author__ = "Alex Li"

import threading
import time


def run(n):
    print("task ", n)
    time.sleep(2)
    print("task done", n, threading.current_thread())


start_time = time.time()
t_objs = []  # 存线程实例
for i in range(50):
    t = threading.Thread(target=run, args=("t-%s" % i,))
    t.setDaemon(True)  # 把当前线程设置为守护线程
    t.start()
    t_objs.append(t)  # 为了不阻塞后面线程的启动，不在这里join，先放到一个列表里

# for t in t_objs: #循环线程实例列表，等待所有线程执行完毕
#     t.join()

time.sleep(2)
print("----------all threads has finished...", threading.current_thread(), threading.active_count())
print("cost:", time.time() - start_time)
# run("t1")
# run("t2")
